/* ===========================================================
   Vet Lectures — static site
   Design concept: veterinary field notebook + exam ledger.
   Deep pine green + parchment paper + amber ink accent.
   =========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Source+Serif+4:opsz,wght@8..60,400;8..60,500;8..60,600;8..60,700&family=IBM+Plex+Sans:wght@400;500;600&family=IBM+Plex+Mono:wght@500&display=swap');

:root{
  --pine-950:#12241f;
  --pine-900:#173a30;
  --pine-800:#20503f;
  --pine-700:#2b6b52;
  --paper:#f2efe4;
  --paper-2:#e8e3d2;
  --card:#fbf9f1;
  --ink:#1c211d;
  --ink-soft:#4b544c;
  --line:#cdc6ac;
  --amber:#b9762b;
  --amber-dark:#8f5a1f;
  --brick:#8a4034;

  --serif: 'Source Serif 4', Georgia, serif;
  --sans: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

a{ color:inherit; text-decoration:none; }
img{ max-width:100%; display:block; }

.wrap{
  max-width:1080px;
  margin:0 auto;
  padding:0 24px;
}

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible{
  outline:2px solid var(--amber-dark);
  outline-offset:2px;
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:0.01ms !important; transition-duration:0.01ms !important; }
}

/* ---------- header ---------- */
.site-header{
  background:var(--pine-950);
  color:var(--paper);
  border-bottom:3px solid var(--amber);
  position:sticky;
  top:0;
  z-index:40;
}
.site-header .wrap{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  padding-top:14px;
  padding-bottom:14px;
}
.brand{
  display:flex;
  align-items:baseline;
  gap:10px;
  font-family:var(--serif);
  font-size:1.5rem;
  font-weight:600;
  letter-spacing:0.01em;
  color:var(--paper);
}
.brand small{
  font-family:var(--mono);
  font-size:0.62rem;
  color:var(--amber);
  letter-spacing:0.08em;
}
.main-nav{
  display:flex;
  align-items:center;
  gap:28px;
}
.main-nav a{
  font-size:0.94rem;
  color:#d9d3bd;
  padding:6px 2px;
  border-bottom:2px solid transparent;
}
.main-nav a:hover, .main-nav a.active{
  color:var(--paper);
  border-bottom-color:var(--amber);
}
.nav-toggle{
  display:none;
  background:none;
  border:1px solid #3c5348;
  color:var(--paper);
  border-radius:4px;
  padding:8px 10px;
  font-size:0.9rem;
  font-family:var(--sans);
}

@media (max-width: 760px){
  .nav-toggle{ display:inline-flex; align-items:center; gap:8px; }
  .main-nav{
    position:absolute;
    top:100%; left:0; right:0;
    background:var(--pine-900);
    flex-direction:column;
    align-items:flex-start;
    padding:6px 24px 18px;
    gap:2px;
    display:none;
    border-bottom:3px solid var(--amber);
  }
  .main-nav.open{ display:flex; }
  .main-nav a{ width:100%; padding:10px 0; border-bottom:1px solid #2a4238; }
}

/* ---------- hero ---------- */
.hero{
  background:
    radial-gradient(1100px 420px at 85% -10%, rgba(185,118,43,0.18), transparent 60%),
    var(--pine-950);
  color:var(--paper);
  padding:76px 0 64px;
}
.hero .kicker{
  font-family:var(--mono);
  font-size:0.72rem;
  letter-spacing:0.1em;
  color:var(--amber);
  margin:0 0 18px;
}
.hero h1{
  font-family:var(--serif);
  font-weight:600;
  font-size:clamp(2.1rem, 4vw, 3.15rem);
  line-height:1.14;
  max-width:16ch;
  margin:0 0 22px;
}
.hero p.lede{
  max-width:56ch;
  font-size:1.09rem;
  color:#cfc9b3;
  margin:0 0 34px;
}
.hero-actions{ display:flex; gap:16px; flex-wrap:wrap; align-items:center; margin-bottom:40px;}
.btn{
  display:inline-block;
  font-family:var(--sans);
  font-weight:600;
  font-size:0.95rem;
  padding:13px 24px;
  border-radius:2px;
  border:1px solid transparent;
}
.btn-primary{ background:var(--amber); color:#1c1305; }
.btn-primary:hover{ background:#c9822f; }
.btn-outline{ border-color:#4a5f53; color:var(--paper); }
.btn-outline:hover{ border-color:var(--amber); color:var(--amber); }

.hero-ledger{
  border-top:1px solid #2c4238;
  padding-top:22px;
  display:flex;
  gap:44px;
  flex-wrap:wrap;
}
.hero-ledger div{ font-family:var(--mono); font-size:0.78rem; color:#a9c0b1; }
.hero-ledger strong{
  display:block;
  font-family:var(--serif);
  font-size:1.9rem;
  color:var(--paper);
  font-weight:600;
}

/* ---------- sections ---------- */
section{ padding:58px 0; }
.section-head{
  display:flex;
  justify-content:space-between;
  align-items:flex-end;
  gap:20px;
  border-bottom:1px solid var(--line);
  padding-bottom:14px;
  margin-bottom:8px;
}
.section-head h2{
  font-family:var(--serif);
  font-size:1.7rem;
  font-weight:600;
  margin:0;
}
.section-head .see-all{
  font-family:var(--mono);
  font-size:0.75rem;
  letter-spacing:0.04em;
  color:var(--amber-dark);
  white-space:nowrap;
}
.section-head .see-all:hover{ text-decoration:underline; }
.section-note{ color:var(--ink-soft); font-size:0.95rem; margin:14px 0 30px; max-width:64ch; }

/* subject ledger list */
.subject-list{ list-style:none; margin:0; padding:0; }
.subject-list li{
  border-bottom:1px solid var(--line);
}
.subject-list a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 4px;
}
.subject-list a:hover{ background:var(--paper-2); }
.subject-name{
  font-family:var(--serif);
  font-size:1.15rem;
  font-weight:600;
  display:flex;
  align-items:baseline;
  gap:14px;
}
.subject-name .idx{
  font-family:var(--mono);
  font-size:0.72rem;
  color:var(--ink-soft);
  width:2ch;
}
.subject-meta{
  display:flex;
  align-items:center;
  gap:18px;
  font-family:var(--mono);
  font-size:0.78rem;
  color:var(--ink-soft);
  white-space:nowrap;
}
.subject-meta .count{
  background:var(--pine-800);
  color:var(--paper);
  padding:3px 9px;
  border-radius:2px;
}
.subject-meta .arrow{ color:var(--amber-dark); font-size:1rem; }

/* lecture list (ledger style rows) */
.lecture-list{ list-style:none; margin:0; padding:0; }
.lecture-row{
  border-bottom:1px solid var(--line);
  padding:20px 4px;
  display:grid;
  grid-template-columns:auto 1fr auto;
  gap:18px;
  align-items:start;
}
.lecture-row .date-col{
  font-family:var(--mono);
  font-size:0.72rem;
  color:var(--ink-soft);
  padding-top:4px;
  width:9ch;
}
.lecture-row h3{
  font-family:var(--serif);
  font-size:1.12rem;
  font-weight:600;
  margin:0 0 6px;
  line-height:1.35;
}
.lecture-row h3 a:hover{ color:var(--amber-dark); }
.lecture-tags{ display:flex; gap:8px; flex-wrap:wrap; }
.tag{
  font-family:var(--mono);
  font-size:0.68rem;
  letter-spacing:0.02em;
  color:var(--pine-800);
  border:1px solid var(--line);
  padding:2px 8px;
  border-radius:2px;
  background:var(--card);
}
.lecture-row .qc{
  font-family:var(--mono);
  font-size:0.75rem;
  color:var(--ink-soft);
  text-align:right;
  white-space:nowrap;
  padding-top:4px;
}

/* search box */
.search-box{ position:relative; max-width:420px; margin:0 0 34px; }
.search-box input{
  width:100%;
  font-family:var(--sans);
  font-size:0.95rem;
  padding:12px 14px;
  border:1px solid var(--line);
  background:var(--card);
  color:var(--ink);
  border-radius:2px;
}
.search-box input:focus{ border-color:var(--amber-dark); }
.search-empty{ display:none; color:var(--ink-soft); font-style:italic; padding:16px 4px; }

/* about strip */
.about-strip{
  background:var(--pine-900);
  color:var(--paper);
}
.about-strip .wrap{
  display:grid;
  grid-template-columns:1.1fr 1fr;
  gap:48px;
  padding-top:56px;
  padding-bottom:56px;
  align-items:center;
}
.about-strip h2{ font-family:var(--serif); font-size:1.6rem; margin:0 0 14px; }
.about-strip p{ color:#cfc9b3; font-size:0.98rem; }
.about-strip .signature{
  font-family:var(--serif);
  font-style:italic;
  color:var(--amber);
  margin-top:18px;
}
.channel-card{
  border:1px solid #35544a;
  padding:26px;
  background:rgba(255,255,255,0.03);
}
.channel-card .k{ font-family:var(--mono); font-size:0.7rem; color:var(--amber); letter-spacing:0.06em; }
.channel-card h3{ font-family:var(--serif); font-size:1.2rem; margin:10px 0 16px; }

@media (max-width:760px){
  .about-strip .wrap{ grid-template-columns:1fr; }
}

/* ---------- article / post page ---------- */
.post-header{ background:var(--pine-950); color:var(--paper); padding:44px 0 34px; }
.breadcrumb{ font-family:var(--mono); font-size:0.72rem; color:#a9c0b1; margin-bottom:16px; }
.breadcrumb a:hover{ color:var(--amber); }
.post-header h1{
  font-family:var(--serif);
  font-size:clamp(1.7rem, 3vw, 2.3rem);
  line-height:1.25;
  margin:0 0 16px;
  max-width:34ch;
}
.post-meta{ display:flex; gap:16px; flex-wrap:wrap; font-family:var(--mono); font-size:0.75rem; color:#a9c0b1; }

.article{ max-width:760px; margin:0 auto; padding:48px 24px 80px; }
.article h2{ font-family:var(--serif); font-size:1.35rem; margin:36px 0 14px; }
.article h3{ font-family:var(--serif); font-size:1.05rem; margin:26px 0 8px; color:var(--pine-800); }
.article p{ margin:0 0 14px; }
.article ol, .article ul{ padding-left:1.3em; margin:0 0 14px; }
.article li{ margin-bottom:10px; }
.article table{ width:100%; border-collapse:collapse; margin:18px 0; font-size:0.92rem; }
.article table td, .article table th{ border:1px solid var(--line); padding:8px 10px; text-align:left; }
.article figure{ margin:20px 0; }
.article figcaption{ font-family:var(--mono); font-size:0.72rem; color:var(--ink-soft); margin-top:6px; }
.article a{ color:var(--amber-dark); text-decoration:underline; text-decoration-color:var(--line); }

.qa-toggle-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  background:var(--card);
  border:1px solid var(--line);
  padding:16px 20px;
  margin:8px 0 30px;
}
.qa-toggle-bar p{ margin:0; font-size:0.92rem; color:var(--ink-soft); }
.btn-reveal{
  font-family:var(--mono);
  font-size:0.78rem;
  letter-spacing:0.03em;
  background:var(--pine-900);
  color:var(--paper);
  border:none;
  padding:11px 18px;
  cursor:pointer;
  border-radius:2px;
  white-space:nowrap;
}
.btn-reveal:hover{ background:var(--pine-800); }

.answers-panel{
  border-top:3px double var(--amber);
  margin-top:36px;
  padding-top:30px;
}
.answers-panel[hidden]{ display:none; }
.answers-panel .a-label{
  font-family:var(--mono);
  font-size:0.72rem;
  letter-spacing:0.06em;
  color:var(--amber-dark);
  margin-bottom:14px;
}

.related-box{
  background:var(--paper-2);
  padding:32px 0 44px;
}
.related-box h2{ font-family:var(--serif); font-size:1.25rem; margin:0 0 18px; }

/* generic content page (about/privacy/contact) */
.content-page{ max-width:720px; margin:0 auto; padding:52px 24px 80px; }
.content-page h1{ font-family:var(--serif); font-size:2rem; margin:0 0 22px; }
.content-page h2{ font-family:var(--serif); font-size:1.25rem; margin:30px 0 12px; }
.content-page p{ margin:0 0 14px; color:var(--ink); }
.content-page a{ color:var(--amber-dark); }

.contact-form{ display:grid; gap:16px; max-width:480px; margin-top:24px; }
.contact-form label{ font-family:var(--mono); font-size:0.72rem; letter-spacing:0.04em; color:var(--ink-soft); display:block; margin-bottom:6px; }
.contact-form input, .contact-form textarea{
  width:100%; font-family:var(--sans); font-size:0.94rem; padding:11px 12px;
  border:1px solid var(--line); background:var(--card); border-radius:2px;
}
.contact-form textarea{ min-height:130px; resize:vertical; }
.contact-note{ font-size:0.85rem; color:var(--ink-soft); margin-top:6px; }

/* ---------- footer ---------- */
.site-footer{
  background:var(--pine-950);
  color:#a9c0b1;
  padding:48px 0 30px;
  margin-top:0;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr;
  gap:36px;
  padding-bottom:30px;
  border-bottom:1px solid #26403590;
}
.footer-grid h4{
  font-family:var(--mono);
  font-size:0.7rem;
  letter-spacing:0.08em;
  color:var(--amber);
  margin:0 0 14px;
}
.footer-grid p{ font-size:0.88rem; line-height:1.65; max-width:34ch; }
.footer-links{ list-style:none; margin:0; padding:0; display:grid; gap:9px; font-size:0.88rem; }
.footer-links a:hover{ color:var(--paper); }
.social-row{ display:flex; gap:12px; margin-top:14px; }
.social-row a{
  width:34px; height:34px; border:1px solid #345349; border-radius:50%;
  display:flex; align-items:center; justify-content:center; color:#cfc9b3;
}
.social-row a:hover{ border-color:var(--amber); color:var(--amber); }
.social-row svg{ width:16px; height:16px; fill:currentColor; }
.footer-bottom{
  display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px;
  padding-top:22px; font-size:0.78rem; font-family:var(--mono); color:#7d9186;
}
@media (max-width:760px){ .footer-grid{ grid-template-columns:1fr; } }

/* 404 / empty */
.empty-state{ text-align:center; padding:70px 24px; color:var(--ink-soft); }